Remove the stems from the blackberries, remove the bad fruit and fill the berries with the vanilla sugar, candy, spices and the grain in a bottle.
Close well. Leave to infuse at room temperature for 3 months.
Then filter the liqueur and pour it back into the bottle repeatedly, close well.
Store cooled for a few more weeks and then pour off.
Tip: Stock up on a range of high-quality spices – it pays off!